Railway-traffic-controlling apparatus



March 24, '1931. G. W.'BAUGHMAN 1,797,314

RAILWAY TRAFF' IC CONTROLLING APPARATUS Filed May 23, 1930 INVENTOR'. G.W. Ba uglwman,

M i Z Patented MarrZQ1931 GEORGE?WQ iAUGHM-Aii, or- PITTSBIURGH, :PEnsYLvANIA; nssrenon Tome unronf 'swirorr 8t SIGNAL ofoMr'AnY, orswlssvn'nn, rnNnsYnvANI- Aconronnirion or;

a :PENNSYLVA'NIA,

Y -iitArtwAY ritArrIo-co1wROLLING ArrAnA'rus 1 "Ap li a ion filed May23, 1930. semi no; 454,926.];

7 Myinvention relates to railway traflic on trolling apparatu's,' andparticularly: to ap paratusfofthe type comprising train 'carrled tuswhenthe train is operating Ioutsidei of overnin ceived from the trackway;

One ofthefeaturesof ypresentinventionc is the provision of means forpreventing the train jcontrol territory. I will described one;fo'rmofthe novelfeatures thereof in claims? The accompanying .idrawing is adiagram matic' View. illustrat ng one fo'rm'jiof tram. carried"apparatus? embodying my inventlon;

' "Referring-to thef 'drawing, the reference character D, designates thetrain carried 7 polarizedfniast'er relay. of a-calosignalingapparatus,-such as'thatdisclosed in the copending applicationotLloydCVfLewis, Serial No.

traincontrol territory 210,165, filed. Augusta, 1927,'"for Railwaytraflic controlling apparatus. This relay is provided with a contact 18which is connect-1 ed with a terminal w of a suitable source ofdire ctcurrent and which oscillates between contacts 125F 18 at a frequencycorresponding to that of the code being'transmitted to the trainduringsuchtime as thetrainis in 1 Associated with the "master relay-flDis a transformer T comprising a primary 19 and a secondary 20. ,Theprimaryl9 ofthis transformer has its (end terminals connectedwith thecontacts 18 and; 18F respectively of'the relay D, and intermediatepoint-of the":

primary is connected a terminal not the sourceof direct current; Thesecondary 20 of the transformer T isconnected with a plurality ofparallel circuits each designated byjthereference character 0withadistinguishing exponent; When the relay D is energized in onedirection toclose contact 18+ 18 current flows from terminal m throughthe left-handportion of primary 19 in onedirect1on,- but when the relayD'i's' energized in the oppositewdirection to close" contact 1818",

"5 urr iflows from terminal a: through -the 0' means controlled by;energy. re

apparatus embodyingmy inventioinandl-will thenpoin't out I t t V l eludea condenser 22 and are tunedtoreso r q 'cles per minuterespectivelyqThecircui C reversed. at the frequency of the operation lot i relay D.As aresult of- -t his,jthere is induced I theLsecondaryQO alow}'-frequency alternat *in electroinotive force which is supplied-to tV The circuits 0 each includeareactor Qland, i a; rectifierhhavingdistinguishingiexponents;

the" circuits C.

i portion of primary -19 T posite direction. .,,It'follows thatWhen-.-lh6f In addition, thercircuits C and Cieachin-gnance at :codeirequencies of I20 andl 80; cyjhowever, is responsive to, -al-l ofthejcede i fre quencies emp1oyed,-that istosay,gto;freaquenciesbetWeen'SO and; 180 cycles per fmin-f'a ute. .UDecodingrelays R ,'R andR ar-e conn cted across the rectifiers 171 h? and, respectively, and control a plurailityofsignal lamps 23, 24,25 and 26located in thejcah iac'jf cording to theparticular,code-being received;

in a manner presently to be described. These."

lampsj'are adapted tofdisplay differentindica l o tions.

be'empl'oyed to indicate clear,""approach re;

- stricted, approach and-caution or slow speed'nrespectively. By reasonof the tuned circuits above described, an cycle code will cause theenergizationof relay R only, a cycle code will cause the energization'of the.

cause the energiz ation of relays R andR.

1' Ittwill; be apparentfroni the foregoing that;- relay-R is energizedWhen relay Dis operating at any of the train control I frequencies ofcurrentthat may. be produced in-the track rails from other causes suchas by'crossovers; Y

85 relays R and R -Qand'a cycle code-will U 7970- I and" therefore, 'byreason of this: characterist1c,1t mayalso'be responsive to certainsurges ritory. During'thetimethat the train occuo pies train controlterritory, thejoperationfof therapparatus. is not: seriously afieeted byshock excitations, as explained in the Lewis application above referredto, but when the train is operating outside of such territory, rapidlyrepeated shock excitations may cause the apparatus to funct on so as toilluminate the lamp 25 and display a false"approach indication in thecab. These indications are sometimes of, a duration sufficient torequire,

an acknowledgment by the engineer in order to avoid an automatlcappllcation of the .brakes, and While not dangerous in nature, they mayoccur at points wheregthe. atte'n tionlo'f the, engineer should beconcentrated upon trackway conditions ahead and may therefore be asource of annoyance and in{ convenience: Y

This condition is avoided in the present apparatus by the provision of aplurality counting relays L L L and Lwhich re operations of relay inorder to cause. lamp 1 to'become lighted; If'the train is operat-.;

quires at least a given'number of sequential ing within train controlterritory and a. coded signal is being transmitted to the train,th'e;

relays L ,.L L and L? are all energized. by v1rtue of't'wo stick circuts, one, being from terminal through front contact 27 of de-Qcoding'relay R winding of relayL, front contact28 ofrelay L and windingof this re,-

lay to terminalja'j The other of these circuits 7 I is from terminalnthrough front contact '27 i jof'd'ecoding-relay R ivinding' of relay 'Ly front contact 29 of-relay L and winding of this-relay t'o 'terminalfolI If the coded'signal is of lSOCycle frequency, the decoding relay R?will also be energized and" cause the iliuminationof the-clear? signallamp 23, by,

virtue of a circuit 'froin-terminalw, through frontcontact 30 0f;decoding relay R and 1amp23 to terminal 0; If a 120 cycle or ap-.

proach restricted code is being received, the decoding relays R and R?will be energized and cause the illi'unination of the lamp 24 by virtueof a circuit from terminal 00, through back contact 30 of relay R frontcontact 31 of relay R and lamp 24 to terminal 0. If an 80 cycle orapproach-codeis' being received,

7 the decoding relay-R only will beenergized,

thereby causing the signal lamp25 to be il luminatedby'virt 'ie of 'acircuit from termi= nal w, through back contact 30 of relay-R Vback'conta'ctgl of relay fi yfront contactj32l of relay L frontcontact33 of decoding relay 7 R and lamp 25 to terminalo;

' I willnow assume thatthe-train is operat ing outside of traincontrolterritory and that thecab signaling apparatus is therefore notfunctioning. Under such conditionthe master relay D as well as thedecoding relays R R and'ld andjalso the counting relays L L L and L? areall 'deenergized as shown in the drawing, and lamps 23', 24 and 25 are"extinguished. Lamp 26. is flighted by a cir cu1t which includeshackcontacts 30, land 32 -19111; for .purposes'of the present invention,

this fact can'be disregarded. Ifa rapid succession of unusually heavysurges or impulses of current are now produced in the track rails, suchas may be. caused by any of the conditions liereinbefore mentioned,the'relay D may become energized and cause the contact18 hereof tooscillatebetween its contact 1 *18-- at the frequency of such surges.

-The first tw'o strokes of'the contact 18 from the position shown inthed-rawing will cause one cycle of alternating current to be producedin'theo irc uit G which, upon being rectified by the rectifier 70, maybe sufficient 'toenergize'therelayR and cause it to close its frontcontact 34. Upon the next half closes, therebyestablishing' a circuit"from terminal a, throughccntact.18--18 of relay;

D, front'contact 34 or re1ay-R back contact 35.01 relay L and winding ofrelay Llto terminal 0. Thecurrent in this c rcuit energizes relay L? andcauses it to close its front contact 29. Upon the next half stroke ofrelay D, contact -18'18"is opened,' thereby interrupting at this point,the circuit jus't traced, but the relay L is, however, main tainedenergized by virtue of the stick circuit previously traced through thecontact 29 of this relay. Thisflstickcircuit energizes relay L and'causes-it to-closeitsfront contact -35. Upon the next hal f'stroke ofrelay D, contact18++18 again closesrbut this time the relay Li isenergized by virtue 'ofa circuit from-terminal :20, through contact 18:18

.of'r'elay'D, front contact 3443f relay R front contact 35 of relay Lback contact 36 .of relay L and winding of ,relayiL to? .ter mi-' nalopThe energiz'ationof this relay causes" it to eloseits front contact'28,Uponthe next half strokeiof'relay D, contact 18+18f again opens andinterrupts the circuit just traced, but the relay L is maintainedenergized by virtue of the stick circuit previously tracedthroughthecontact 28 of this'relay. .This stick' circuit also causestheenergi-zation of relay L? and causes it to open its back contact 36and to close its front contact32, "thereby completing the circuitpreviously traced for the lamp 25, an'dnece'ssitating an acknowledgmentby the engineer, as before. However,.the number of operations of relay.1) required for all of; the counting relays L .to

become energized is-greater than the oscil occur in an uninterruptedsequence, asany' break inth'e centi-nuity of these excitations mittedover the track rails, the 80 cycle 'frequency of this code will causethe energization ofthe decoding relay R the counting 5 relays L; and theilluminationof-the lamp 25,

as previously described. Inasmuch as'there is no delay betweentheenergizati'on of either ofthe relays; R 101 R and the lighting of thef lamps 23 and 24, the clear and approach I restricted indications willbe displayed imcounting relays;

relays controlled by relay R and stickcir i cuits forsaidco'untingrelays "controlledby' 5 '8.Railway.traflidcontrollingapparatus fl i comprising aisignal carriedby atrain, a re-v lay R for controlling the operation of said signal, acontact' device forcontrolling the operation'of relay R a plurality ofcount ing relays adapted tobe energized-in a predetermined sequence'iorcontrolling the op-- eration ofsaid signal jointly with relay; R energ'zlng ClIClllllS for certain of sald counting relays controlled by relayR said" energizing. circuits including the front contacts andthejwindings of certain others of said :In testimony whereof Iafiixmysignature.

; medi'ately upon the train entering train control territory-in whichsuch conditions exist.

' From the foregoing, it will be apparent that tions, this delay doesnot many way impair although the period of delay introduced between theenergization of the decoding relay R 'and the closing of thecirc'uit'controlling .the approach indication lamp- 25 is sulfi- V 1cient to prevent the lighting of thislampin p a majority'of instanceswhere the energiza-V tion ofthe relay R is due to shock excitathe normaloperation of the apparatus;

Although I have 'herein'shown and described only one formofrailwaytraflic controlling apparatus embodying my inventlon, it isunderstood that various changes and modifications may be made thereinwithin the f ,scope or theappended claims without'departm-gingfromthespirit and scope of my invention.

I claim is:

V 1; Railway trafiic controlling apparatus comprising a signal carriedby a train, a re- I 51 lay R for controlling said signal, a contactdevice for controllingthe, operation of relay R a pluralityof countingrelays adapted to be energized in a predetermined sequence forcomprising a signal carried by a train, a relay R for controlling theoperation of said sig- "nal, a contact'device for controlling the 0p-Vmined sequence for controlling theoperation controlling the operationof said signal joint- 7 1y withthe relay R energizing circuits for saidcounting relays controlled by said contact device, energizing circuitsfor said counting relays controlled by relay R and stick circuits forsaid counting relays also conis trolled by relay R Haying thusdescribedmy invention, what 2. Railway trafiic controlling apparatus I erationofrelay R a plurality of counting r I relays adapted to be energized in apredeterot said signal jointly with relay R ener-' gizing circuitsforcertain of said counting E R EW- A i "no

